Arc'teryx Atom LT Hoody

Arc’teryx built the Atom LT Hoody as the active-insulation layer that finally solved the warmth-versus-breathability compromise. Coreloft synthetic insulation in the body, stretch-woven side panels for breathability, and a low-profile hood that fits cleanly under a shell or alone make it the layer outdoor athletes reach for first.

It is the piece climbers throw on at belays, skiers wear under shells on lift rides, and hikers layer for cool mornings that warm up by mid-morning. The genius is the breathability: most synthetic puffies trap moisture, and this one does not.

What sets it apart

• Coreloft synthetic insulation that holds warmth even when damp.
• Stretch-woven side panels for active-use breathability.
• Low-profile hood that fits under a shell helmet.
• Arc’teryx build quality designed for serious outdoor use.

For climbers, skiers, and hikers building a layering system that actually works, this is the hoody worth investing in once and using for years.